Citation: Dollase, W. A. (1969). Crystal structure and cation ordering of piemontite. American Mineralogist, 54, pp. 710-717.
Formula: Al1.97 Ca1.87 Fe0.31 H Mn0.72 O13 Si3 Sr0.13
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al6 Fe4 H2 Mn4 O26 Si6 (Al3 Fe2 H Mn2 O13 Si3)
Multiplicity: 1